Intimidation factor: Moderate. It is almost voyeuristic, like intruding into someone’s dressing room.

Number of salespeople on floor: One, owner Mireille Watson.

Response time: Immediate. Watson looks up from her computer and gives you the once over.

Vibe: Fashion museum meets boudoir.

Price range: From $50 for a vintage satin nightie to $4,500 for an Hermès Kelly bag.

Rating: Three Missoni printed pants out of four.

I am drawn to Thrill of the Find every time I pass it while travelling on the TTC, enticed by the Thrill of the Week item in the window.

Also, a friend kept regaling me with her “thrilling” finds, like discount Prada.

But the first time I go there, it is closed. The shop is open Wednesday through Sunday.

When I actually gain entrance, I am impressed with how carefully curated the boutique is, unlike some stores where the racks converge on each other, so crammed that you can’t see anything.

There is room to navigate the mélange of vintage and contemporary designer clothing and accessories from the ’30s onwards — not on consignment and in immaculate condition. Owner Mireille Watson sources everything personally, and she selects brilliantly.

She is French, the consummate collector. It is in her blood. “My mother dressed me in Baby Balmain,” she says.

Labels include Armani, Moschino, Lida Baday, Versace, Jil Sander and some European lines I am unfamiliar with, including a fabulous coat with semi-precious stones for buttons from Hoss Intropia, founded by the former costume designer for the National Ballet of Spain.

There is an Eileen Fisher chiffon coat in teal blue that is not the least bit dowdy, which that line tends to be.

I head to the vintage section, where Watson pulls out a rare Courrèges shift dress in mint condition for $495. You could so see Daisy Buchanan in it.

Another one-of-a-kind find: a black ’50s cocktail dress by costume designer Helen Rose, who made Grace Kelly’s wedding dress when she married Prince Rainier.

She carries a small selection of shoes. I spy a spectacular pair of black-and-white booties with newspaper print on the top by John Galliano. I try them on but, dammit, they are too small.

Watson jokingly offers to alter my feet.

She doesn’t particularly care if they sell. She likes them as set decoration.

I try on a striped silk safari jacket by Yves Saint Laurent from the ’70s ($175) but it is too small. Sizing tends to run small to medium.

She suggests I move the buttons; I’m not in the button-moving business.

But the Ralph Lauren Purple Label gold-flecked coat is a good fit; the price, $495, not so much.

I’m still grappling in the dressing room (which is really hot) when I hear a gasp. Watson is trolling the internet and finds a Chanel dress listed for $1,600 which she has marked at $400.

I try on a pair of wild striped Missoni pants which run smallish. She goes to the back room and returns with a silk pair that are roomier but with front pleats. As a public service, I don’t do front pleats.

Wilson carries a fabulous line of costume jewelry in the $300 to $400 range by Lawrence Vrba, who designed for iconic Miriam Haskell, maker of bijoux worn by Joan Crawford and the Duchess of Windsor. I covet all the pieces.

I am told that if Watson gets to know you and she likes you, she’ll invite you to shop the hallowed back room. This could be the start of a beautiful friendship.

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